#include <cassert>
#include <iostream>
#include <cstdint>


/**
 * Main function
 */
int main() {
    #if __cplusplus == 201103L
    std::cout << "C++11" << std::endl;
    #elif __cplusplus == 201402L
        std::cout << "C++14" << std::endl;
    #elif __cplusplus == 201703L
        std::cout << "C++17" << std::endl;
    #elif __cplusplus == 202002L
        std::cout << "C++20" << std::endl;
    #else
        std::cout << "Unknown C++ version: " << __cplusplus << std::endl;
    #endif
    return 0;
}

